README and podspec update

Author: pmusolino

PMAlertController.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name         = "PMAlertController"
-  s.version      = "3.5.0"
+  s.version      = "4.0.0"
   s.summary      = "PMAlertController is a great and customizable substitute to UIAlertController"
   s.description  = <<-DESC
   					PMAlertController is a small library that allows you to substitute the uncustomizable UIAlertController of Apple, with a beautiful and totally customizable alert that you can use in your iOS app. Enjoy!

README.md

@@ -3,7 +3,7 @@
 </p>
 
 
-  [![Language](https://img.shields.io/badge/Swift-3%20%26%204-orange.svg)]()
+  [![Language](https://img.shields.io/badge/Swift-4%20%26%205-orange.svg)]()
   [![GitHub license](https://img.shields.io/cocoapods/l/PMAlertController.svg)](https://github.com/pmusolino/PMAlertController/blob/master/LICENSE)
   [![Pod version](https://img.shields.io/cocoapods/v/PMAlertController.svg?style=flat)](https://cocoapods.org/pods/PMAlertController)
   [![Carthage Compatible](https://img.shields.io/badge/Carthage-compatible-yellow.svg)](https://github.com/Carthage/Carthage)
@@ -32,15 +32,15 @@ PMAlertController is a small library that allows you to substitute Apple's uncus
 - [x] Carthage
 - [x] Animation with UIKit Dynamics
 - [x] Objective-C compatibility
-- [x] Swift 2.3, Swift 3, Swift 4, Swift 4.2 support
+- [x] Swift 4, Swift 4.2 & Swift 5 support
 - [ ] Swift Package Manager
 
 
 ## Requirements
 ----------------
 
 - iOS 9.0+
-- Xcode 9+
+- Xcode 10+
 
 ## CocoaPods
 ----------------
@@ -127,7 +127,9 @@ self.present(alertVC, animated: true, completion: nil)
 
 ## Swift compatibility
 
-- If you use **Swift 4.0 or higher**, you can use the [latest release](https://github.com/pmusolino/PMAlertController/releases).
+- If you use **Swift 5.0 or higher**, you can use the [latest release](https://github.com/pmusolino/PMAlertController/releases).
+
+- If you use **Swift 4.0 or higher**, you can use the [release 3.5.0](https://github.com/pmusolino/PMAlertController/releases/tag/3.5.0).
 
 - If you use **Swift 3**, you can use the [release 2.1.3](https://github.com/pmusolino/PMAlertController/releases/tag/2.1.3).